JP2019009026A - Method of manufacturing wire with terminal - Google Patents

Abstract

To provide a method of manufacturing a wire with a terminal capable of improving productivity.SOLUTION: The method of manufacturing a wire with a terminal includes: a coating film forming step of forming a film 6 of an ultraviolet curable resin 7 integrally covering a core wire and a terminal 1 with respect to the wire with a terminal having a core wire crimping portion 12 in which a core wire 61 of an electric wire 60 is sandwiched between a top end and a bottom wall of a pair of conductor crimping pieces 22, 23 connected to the bottom wall and a cover crimping portion 13 crimped to a covering 62 of the wire; and an irradiation step of radiating ultraviolet rays to the coating film. In the coating film forming step, a coating film is formed with an ultraviolet curable resin which is injected from a discharge port, while relatively moving the discharge port for intermittently injecting a droplet 3 of the ultraviolet curable resin and the wire with the terminal. The direction of the relative movement of the discharge port and the wire with the terminal in the coating film forming step is a direction Y1, Y2 orthogonal to the direction of injection of the droplet.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a method for manufacturing a terminal-attached electric wire.

  Conventionally, there are anticorrosion techniques for electric wires with terminals. In Patent Document 1, a sealing step of applying and sealing a sealing resin in a first viscosity state so as to cover the core wire exposed portion of the covered electric wire, and heating the core wire exposed portion to seal the surrounding sealing resin A core wire heating process in which the viscosity is changed to a second viscosity state lower than the first viscosity state and infiltrated and filled between the terminal and the core wire and between the core wires, and curing for completely curing the sealing resin. The technique of the manufacturing method of the electric wire with a terminal provided with a process is disclosed.

  Patent Document 2 discloses a conductor in a terminal-attached electric wire that includes an electric wire and a terminal fitting having a box-like terminal connecting portion connected to a conductor connecting portion connected to a conductor portion of the electric wire and a counterpart terminal. The technique of the coating | coated apparatus which coat | covers the connection part of a part and a conductor connection part with a coating | covering material is disclosed. The coating apparatus of patent document 2 has a holding means for holding the electric wire with terminal. The holding means includes a terminal mask portion that includes an accommodating portion that accommodates the terminal connecting portion and covers the terminal connecting portion.

  Patent Document 3 discloses a technique of a terminal support device with an electric wire that is used when a sealing material is supplied from a nozzle to an electric wire / terminal connection portion. The terminal support device with an electric wire of Patent Document 3 includes a terminal simple holding portion that detachably holds an electric contact portion of a terminal metal fitting when a reaction force that causes the electric wire to bend and return to the original state is generated. And a simple electric wire holding portion for detachably holding the resin coating of the electric wire.

JP, 2006-225171, A Japanese Unexamined Patent Publication No. 2017-4878 JP-A-2006-219233

  It is desirable that the man-hours required for the anticorrosion treatment can be reduced and the productivity of the electric wire with terminal can be improved. For example, if the time required for forming the resin coating can be shortened, the productivity of the electric wire with terminal can be improved.

  The objective of this invention is providing the manufacturing method of the electric wire with a terminal which can aim at the improvement of productivity.

  The method for manufacturing a terminal-attached electric wire according to the present invention includes a core wire crimping portion in which a core wire of a wire is sandwiched between a tip of a pair of conductor crimping pieces connected to a bottom wall and the bottom wall, and a coating of the wire A coating forming step of forming a coating of an ultraviolet curable resin integrally covering the core wire and the terminal with respect to the terminal-attached electric wire having a terminal including a crimped coated crimping portion, and irradiating the coating with ultraviolet rays The ultraviolet ray emitted from the discharge port while relatively moving the discharge port for intermittently ejecting the droplets of the ultraviolet curable resin and the terminal-attached electric wire in the film forming step. The coating film is formed of a curable resin, and the direction of relative movement between the discharge port and the terminal-attached electric wire in the coating film forming step is a direction orthogonal to the droplet ejection direction.

  The method for manufacturing a terminal-attached electric wire according to the present invention includes a core wire crimping portion in which a core wire of a wire is sandwiched between a tip and a bottom wall of a pair of conductor crimping pieces connected to the bottom wall, and crimping to the sheath of the wire A coating forming step of forming a coating of an ultraviolet curable resin that integrally covers the core wire and the terminal, and an irradiation step of irradiating the coating with ultraviolet rays on a terminal-attached electric wire having a terminal including the coated crimping portion. ,including. In the film forming step, the film is formed by the ultraviolet curable resin ejected from the ejection port while relatively moving the ejection port for intermittently ejecting the droplets of the ultraviolet curable resin and the electric wire with terminal. The direction of relative movement between the discharge port and the terminal-attached electric wire in the film forming step is a direction perpendicular to the droplet ejection direction.

  The manufacturing method of the electric wire with a terminal which concerns on this invention forms a film with the droplet of the ultraviolet curable resin inject | emitted intermittently. According to this film forming method, even if the distance between the ejection port and the target site in the ejection direction varies, the position where the droplets adhere is less likely to occur. The manufacturing method of the electric wire with a terminal concerning the present invention forms a coat, without making a discharge mouth and an electric wire with a terminal move relatively along an injection direction. Therefore, it is possible to shorten the time required for the film forming process and improve productivity.

FIG. 1 is a perspective view showing a crimp terminal and an electric wire according to the embodiment. FIG. 2 is a front view illustrating crimping of a crimp terminal by a terminal crimping mold according to the embodiment. Drawing 3 is a perspective view showing an electric wire with a terminal before film formation concerning an embodiment. FIG. 4 is a cross-sectional view of the terminal-attached electric wire before film formation according to the embodiment. FIG. 5 is a diagram illustrating the injection apparatus according to the embodiment. FIG. 6 is a perspective view illustrating a film forming process of the embodiment. FIG. 7 is a perspective view illustrating a film according to the embodiment. FIG. 8 is a cross-sectional view illustrating a film according to the embodiment. FIG. 9 is a perspective view illustrating an irradiation process of the embodiment. FIG. 10 is another cross-sectional view illustrating the film of the embodiment. FIG. 11 is a plan view illustrating the spread of the liquid droplets according to the embodiment. FIG. 12 is a diagram illustrating another aspect of the injection apparatus according to the embodiment. FIG. 13 is a cross-sectional view of the terminal-attached electric wire before film formation according to the embodiment. FIG. 14 is a cross-sectional view illustrating a film according to an embodiment.

  Below, the manufacturing method of the electric wire with a terminal concerning the embodiment of the present invention is explained in detail, referring to drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

[Embodiment]
The embodiment will be described with reference to FIGS. 1 to 14. This embodiment is related with the manufacturing method of the electric wire with a terminal. FIG. 1 is a perspective view illustrating a crimp terminal and an electric wire according to the embodiment, FIG. 2 is a front view illustrating crimping of the crimp terminal using the terminal crimping mold according to the embodiment, and FIG. 3 is a film according to the embodiment. The perspective view which shows the electric wire with a terminal before formation, FIG. 4 is sectional drawing of the electric wire with a terminal before the film formation which concerns on embodiment, FIG. 5 is a figure which shows the injection apparatus which concerns on embodiment, FIG. FIG. 7 is a perspective view illustrating the coating film of the embodiment, FIG. 8 is a cross-sectional view illustrating the coating film of the embodiment, and FIG. 9 is a perspective view illustrating the irradiation process of the embodiment. FIG. 10 is another cross-sectional view for explaining the coating film of the embodiment, FIG. 11 is a plan view showing the spread of droplets of the embodiment, and FIG. 12 is a diagram showing another aspect of the injection apparatus according to the embodiment. FIG. 13 is a cross-sectional view of a terminal-attached electric wire before film formation according to the embodiment, and FIG. It is a cross-sectional view illustrating a coating facilities forms. 4 is a cross-sectional view taken along the line IV-IV in FIG.

  As shown in FIG. 1, the crimp terminal 1 according to this embodiment includes a terminal connection portion 11, a core wire crimp portion 12, and a cover crimp portion 13. The terminal connection part 11, the core wire crimping part 12, and the covering crimping part 13 are arranged along the longitudinal direction of the crimping terminal 1 in this order. The crimp terminal 1 is formed from a conductive metal plate (for example, a copper plate or a copper alloy plate) as a base material. The crimp terminal 1 is formed into a predetermined shape by punching or bending the base material. The surface of the crimp terminal 1 may be plated with tin (Sn) or the like.

  In the present specification, in the description of the crimp terminal 1, the connection direction with the counterpart terminal, that is, the insertion direction with the counterpart terminal is referred to as a first direction L. The first direction L is the longitudinal direction of the crimp terminal 1. The width direction of the crimp terminal 1 is referred to as a second direction W. The second direction W is orthogonal to the first direction L. In the crimp terminal 1, a direction orthogonal to both the first direction L and the second direction W is referred to as a third direction H. The third direction H is a compression direction by the crimper 50 when the crimp terminal 1 is crimped. The third direction H is the height direction of the crimp terminal 1.

  The terminal connection part 11 is a part electrically connected to the counterpart terminal. The shape of the terminal connection part 11 of this embodiment is a rectangular tube shape. The core wire crimping portion 12 is a portion that is crimped to the core wire 61 of the electric wire 60. The electric wire 60 has a core wire 61 and a coating 62. The material of the core wire 61 is, for example, copper or aluminum. In the electric wire 60 to be crimped by the crimp terminal 1, the covering 62 at the end is removed and the core wire 61 is exposed for a predetermined length. The core wire 61 of this embodiment is an aggregate of a plurality of strands. However, the core wire 61 may be a single wire such as a coaxial cable. The crimp terminal 1 is electrically connected to the exposed core wire 61 by being crimped to the end of the electric wire 60.

  The shape of the core wire crimping part 12 before being crimped to the core wire 61 is a U-shape as shown in FIG. The core wire crimping part 12 has a bottom part 21, a first barrel piece part 22, and a second barrel piece part 23. The bottom portion 21 is a bottom wall portion of the core wire crimping portion 12 and is supported by an anvil 40 described later. The first barrel piece 22 and the second barrel piece 23 are a pair of conductor crimping pieces that are crimped to the core wire 61. The first barrel piece 22 is a side wall portion protruding from one end of the bottom portion 21 in the width direction. The second barrel piece 23 is a side wall portion protruding from the other end of the bottom portion 21 in the width direction. The first barrel piece portion 22 and the second barrel piece portion 23 extend in a direction intersecting the width direction of the bottom portion 21. The first barrel piece 22 and the second barrel piece 23 face each other in the second direction W. As shown in FIGS. 1 and 2, the distance between the first barrel piece 22 and the second barrel piece 23 increases from the bottom 21 side toward the tip side.

  As shown in FIG. 1, the cover crimping portion 13 includes a bottom portion 31, a third barrel piece portion 32, and a fourth barrel piece portion 33. The shape of the coating crimping part 13 before being crimped to the coating 62 is a U-shape as shown in FIG. The bottom portion 31 is a bottom wall portion of the cover crimping portion 13. The third barrel piece 32 is a side wall portion protruding from one end of the bottom portion 31 in the width direction. The fourth barrel piece 33 is a side wall portion protruding from the other end of the bottom portion 31 in the width direction. The third barrel piece 32 and the fourth barrel piece 33 are opposed to each other in the second direction W. The space | interval of the 3rd barrel piece part 32 and the 4th barrel piece part 33 has spread as it goes to the front end side from the bottom part 31 side. The covering crimping part 13 is crimped to the covering 62 by the anvil 40 and the crimper 50.

  The terminal connection part 11 and the core wire crimping part 12 are connected via an intermediate part 14. The height of the intermediate portion 14 is lower than any of the height of the terminal connection portion 11 and the height of the core wire crimping portion 12. The core wire crimping part 12 and the covering crimping part 13 are connected via an intermediate part 15. The intermediate part 15 has a bottom part 15a and a side wall part 15b. The bottom portion 15 a connects the bottom portion 21 of the core wire crimping portion 12 and the bottom portion 31 of the covering crimping portion 13. The side wall 15b extends from both sides of the bottom 15a. One side wall 15 b connects the first barrel piece 22 and the third barrel piece 32. The other side wall portion 15 b connects the second barrel piece portion 23 and the fourth barrel piece portion 33. The height of the side wall portion 15 b is lower than any of the height of the barrel piece portions 22 and 23 of the core wire crimping portion 12 and the height of the barrel piece portions 32 and 33 of the covering crimping portion 13.

  As shown in FIG. 1, the electric wire 60 is placed on the crimp terminal 1 such that the axial direction of the electric wire 60 coincides with the longitudinal direction of the crimp terminal 1. The tip 61 a of the core wire 61 is directed to the terminal connection portion 11 while being placed on the crimp terminal 1. The core wire 61 exposed to the outside from the coating 62 is placed on the core wire crimping portion 12. At this time, the tip 61a of the core wire 61 may protrude from the core wire crimping portion 12 to the terminal connecting portion 11 side. A covering 62 of the electric wire 60 is placed on the covering crimping portion 13. That is, the electric wire 60 is installed such that the tip 62 a of the covering 62 is positioned between the core wire crimping portion 12 and the covering crimping portion 13.

  The core wire crimping part 12 and the covering crimping part 13 are crimped to the electric wire 60 by the anvil 40 and the crimper 50 shown in FIG. The anvil 40 and the crimper 50 are components of the terminal crimping device 100. The anvil 40 is a mold on the support side that supports the core crimping part 12 and the covering crimping part 13 from below. The support surface 40 a of the anvil 40 supports the outer surface of the bottom portion 21 of the core wire crimping portion 12. Therefore, in a state where the core wire crimping portion 12 is supported by the anvil 40, the first barrel piece portion 22 and the second barrel piece portion 23 are in a posture extending obliquely upward from the bottom portion 21. Similarly, the anvil 40 supports the covering crimping portion 13 from below.

  The crimper 50 is a terminal crimping die that sandwiches the crimp terminal 1 and the electric wire 60 between the anvil 40 and crimps the crimp terminal 1 to the electric wire 60. The crimper 50 sandwiches the core wire crimping portion 12 and the core wire 61 between the anvil 40 and crimps the core wire crimping portion 12 to the core wire 61. Further, the crimper 50 sandwiches the coated crimping portion 13 and the coating 62 between the anvil 40 and crimps the coated crimping portion 13 against the coating 62. As shown in FIG. 2, the crimper 50 is disposed above the anvil 40. The crimper 50 moves relative to the anvil 40 along the third direction H. The terminal crimping device 100 has a drive device that moves the crimper 50 up and down in the third direction H.

  As shown in FIG. 2, the crimper 50 has a concave caulking portion 50a. The caulking portion 50 a is a groove-like recess provided on the lower surface of the crimper 50. The crimper 50 of the present embodiment crimps the core wire crimping portion 12 to the core wire 61 by a so-called B-type crimping method (see FIG. 4). As shown in FIG. 2, the caulking portion 50 a has a first wall surface 51 and a second wall surface 52. The first wall surface 51 and the second wall surface 52 face each other in the second direction W.

  The first wall surface 51 and the second wall surface 52 have curved surface portions 53 and 56, intermediate portions 54 and 57, and skirt portions 55 and 58, respectively. The first wall surface 51 and the second wall surface 52 are formed symmetrically with respect to the second direction W, for example. The curved surface portions 53 and 56 are located on the innermost side of the first wall surface 51 and the second wall surface 52, respectively. The curved surface portions 53 and 56 are opposed surfaces that face the anvil 40 in the third direction H. The intermediate portions 54 and 57 connect the curved surface portions 53 and 56 and the skirt portions 55 and 58. The cross-sectional shapes of the intermediate portions 54 and 57 are, for example, linear or substantially linear. The intermediate portions 54 and 57 are inclined so as to go to the end portions of the crimper 50 in the second direction W as they go from the curved surface portions 53 and 56 to the skirt portions 55 and 58.

  The skirt portions 55 and 58 are located on the most inlet side in the first wall surface 51 and the second wall surface 52. The skirt portions 55 and 58 are curved so as to go to the end portion of the crimper 50 in the second direction W from the intermediate portions 54 and 57 toward the inlet of the crimped portion 50a.

(Manufacturing method of electric wire with terminal)
The manufacturing method of the electric wire with a terminal concerning this embodiment is explained. The manufacturing method of the electric wire with a terminal includes a crimping process, a film forming process, and an irradiation process. The crimping process is a process of crimping the crimp terminal 1 to the electric wire 60. The coating forming step is a step of forming the coating 6 of the ultraviolet curable resin 7 that integrally covers the core wire 61 and the core wire crimping portion 12. The irradiation process is a process of irradiating the coating film 6 with ultraviolet rays.

(Crimping process)
The crimping process is executed by the terminal crimping apparatus 100. The terminal crimping device 100 lowers the crimper 50 toward the anvil 40 in a state where the crimp terminal 1 and the electric wire 60 are supported by the anvil 40. As shown in FIG. 2, the core wire 61 is installed in an internal space surrounded by the bottom portion 21, the first barrel piece portion 22, and the second barrel piece portion 23, and is placed on the inner surface of the bottom portion 21, for example. . When the crimper 50 is lowered toward the anvil 40, the first barrel piece 22 contacts the first wall surface 51 and the second barrel piece 23 contacts the second wall surface 52 as shown in FIG. .

  The curved surface portion 53 of the first wall surface 51 bends the first barrel piece portion 22 toward the second barrel piece portion 23 to bend the first barrel piece portion 22. More specifically, the first wall surface 51 bends the first barrel piece 22 in a substantially J shape so that the tip 22a of the first barrel piece 22 faces the core wire 61 in the third direction H. The curved surface portion 56 of the second wall surface 52 bends the second barrel piece portion 23 toward the first barrel piece portion 22 to bend the second barrel piece portion 23. More specifically, the second wall surface 52 bends the second barrel piece 23 in a substantially J shape so that the tip 23 a of the second barrel piece 23 faces the core wire 61 in the third direction H.

  Moreover, the 1st wall surface 51 and the 2nd wall surface 52 press the 1st barrel piece part 22 toward the 2nd barrel piece part 23 side, and face the 2nd barrel piece part 23 toward the 1st barrel piece part 22 side. And press. As a result, as shown in FIGS. 3 and 4, the core wire crimping portion 12 is crimped to the core wire 61 such that the cross-sectional shape thereof is substantially B-shaped. As shown in FIG. 4, in the core wire crimping portion 12 after crimping, curved portions 22 b and 23 b are formed in the first barrel piece portion 22 and the second barrel piece portion 23, respectively. The shape of the curved portions 22b and 23b is a curved shape convex toward the side opposite to the bottom 21 side.

  The curved portion 22b of the first barrel piece portion 22 is bent so that the distal end 22a is positioned closer to the second barrel piece portion 23 than the base end portion 22c. The curved portion 23b of the second barrel piece 23 is bent so that the distal end 23a is located closer to the first barrel piece 22 than the base end 23c. The end portions 22 a and 23 a of the barrel pieces 22 and 23 sandwich the core wire 61 of the electric wire 60 between the bottom portion 21. The barrel pieces 22 and 23 wrap the core wire 61 by the curved portions 22 b and 23 b, the base end portions 22 c and 23 c, and the bottom portion 21, and are crimped to the core wire 61.

  The curved portion 22b of the first barrel piece portion 22 and the curved portion 23b of the second barrel piece portion 23 are in contact with each other. More specifically, the distal end portions of the curved portions 22b and 23b are in contact with each other in the second direction W. A groove portion 24 is formed by the curved portions 22b and 23b in contact with each other. The groove portion 24 is a groove-shaped portion formed by the wall surfaces of the curved portions 22 b and 23 b and extends along the first direction L. The width of the groove part 24 in the second direction W becomes narrower toward the bottom part 21.

  In addition, the cover crimping part 13 is crimped | bonded with respect to the coating | cover 62 so that it may mutually overlap, for example, as shown in FIG. For example, the third barrel piece 32 is wound around the outer peripheral surface of the covering 62, and the fourth barrel piece 33 is wound outside the third barrel piece 32. However, the crimping form of the covering crimping part 13 is not limited to this. For example, the third barrel piece 32 and the fourth barrel piece 33 may be wound around different positions in the first direction L in the covering 62.

  In this embodiment, the coating 6 of the ultraviolet curable resin 7 is formed on the crimp terminal 1 and the electric wire 60 after crimping. Therefore, the terminal-attached electric wire before the coating 6 is formed is referred to as “terminal-attached electric wire 4 before forming the coating”, and the final terminal-attached electric wire after the coating 6 is formed is simply referred to as “terminal-attached electric wire 5”. Called.

(Film formation process)
A film formation process is performed by the injection apparatus 70 shown in FIG. 5, for example. The ejection device 70 is a device that intermittently ejects the droplets 3 of the ultraviolet curable resin 7. The ultraviolet curable resin 7 is, for example, a urethane acrylate resin. As shown in FIG. 5, the injection device 70 includes a main body 71, an injection unit 72, and a holding unit 73. The main body 71 is a main body portion of the injection apparatus 70 and is fixed to a mounting table such as a work table. The injection part 72 is supported by the main body 71 via the arm part 74. The injection unit 72 includes a nozzle 72a and an injection mechanism 72b. The nozzle 72a is a cylindrical hollow member. The discharge port 72 c at the tip of the nozzle 72 a faces the holding unit 73.

  The ejection mechanism 72b is a mechanism that intermittently ejects the droplet 3 of the ultraviolet curable resin 7 from the nozzle 72a. The injection mechanism 72b intermittently pumps a fixed amount of resin to the nozzle 72a by reciprocating the piston. The means for applying a biasing force to the piston is, for example, a spring or a piezoelectric element. The resin sent to the nozzle 72a jumps out from the tip of the nozzle 72a. The resin that has jumped out of the nozzle 72 a becomes droplet 3 and flies toward the holding unit 73. The droplet 3 is given acceleration by the ejection mechanism 72b. Accordingly, the droplet 3 travels on the trajectory on the extension line of the nozzle 72a.

  The holding | maintenance part 73 hold | maintains the electric wire 4 with a terminal before film formation. The holding | maintenance part 73 hold | maintains the electric wire 4 with a terminal before a film formation in the position facing the nozzle 72a. The electric wire with terminal 4 before the coating is formed is held with the bottom portion 21 facing downward and the curved portions 22b and 23b facing upward. That is, the terminal-attached electric wire 4 before film formation is held by the holding portion 73 in a posture in which the third direction H coincides with the vertical direction. Moreover, the electric wire 4 with a terminal before film formation is hold | maintained by the holding part 73 so that the axial direction of the crimp terminal 1 may turn into a horizontal direction. That is, the terminal-attached electric wire 4 before the coating is formed is held so that the first direction L is horizontal.

  The holding portion 73 is movable relative to the main body 71 of the injection device 70 along the first direction L. The injection device 70 has a drive mechanism that moves the holding portion 73 relative to the main body 71 in the first direction L. The drive mechanism is a mechanism including a motor, for example. When the holding portion 73 moves in the first direction L, the relative position of the terminal-attached electric wire 4 before the coating is formed with respect to the nozzle 72a changes. The movable range of the holding portion 73 is determined so that the droplet 3 can be attached to the range from the tip of the core wire 61 to the covering crimping portion 13. That is, the holding unit 73 moves the terminal-attached electric wire 4 before the coating is formed in the first direction L from the position where the tip of the core wire 61 is opposed to the nozzle 72a to the position where the coated crimping unit 13 is opposed to the nozzle 72a. Can do.

  The injection mechanism 72b has a mechanism for moving the nozzle 72a in the second direction W. The second direction W is a direction orthogonal to the paper surface in FIG. That is, the injection device 70 can change the relative position between the terminal-attached electric wire 4 and the nozzle 72a before the coating is formed in the first direction L and the second direction W. The movable range of the nozzle 72 a corresponds to the width of the core wire crimping portion 12. The nozzle 72 a is movable from a position facing the one end in the second direction W in the core wire crimping portion 12 to a position facing the other end in the second direction W. In the injection device 70 of the present embodiment, the relative position of the nozzle 72a with respect to the holding portion 73 is fixed in the third direction H. In other words, the nozzle 72 a does not move relative to the holding unit 73 in the third direction H.

  FIG. 6 shows the terminal-attached electric wire 4 before film formation, which is positioned at a position where the nozzle 72a and the cover crimping portion 13 face each other. The injection device 70 of the present embodiment applies the ultraviolet curable resin 7 from the coated crimping portion 13 side toward the terminal connecting portion 11 side. The ejection device 70 ejects the droplet 3 from the nozzle 72a at a constant time interval. The ejected droplet 3 travels in the air along the third direction H and adheres to the terminal-attached electric wire 4 before the film is formed. The ejection device 70 reciprocates the nozzle 72a in the second direction W as indicated by the arrow Y1 while ejecting the droplet 3 intermittently.

  Further, the injection device 70 moves the holding portion 73 in the first direction L as indicated by the arrow Y2. The moving direction of the holding portion 73 is a direction from the core wire crimping portion 12 toward the covering crimping portion 13. The ejection device 70 continuously ejects the liquid droplet 3 at a predetermined interval while relatively moving the terminal-attached electric wire 4 and the nozzle 72a before forming the coating as described above, and the core wire 61 and the core wire crimping portion 12 are integrated. A covering film 6 (FIG. 7) is formed. The film 6 of this embodiment covers the exposed part of the core wire 61 and blocks the exposed part of the core wire 61 from the external space. In the terminal-attached electric wire 4 before film formation of the present embodiment, the exposed portions of the core wire 61 are the tip 61a of the core wire 61 and the intermediate exposed portion 61b.

  The tip 61a is a portion exposed from the core wire crimping portion 12 toward the terminal connecting portion 11 side in the terminal-attached electric wire 4 before the coating is formed. The intermediate exposed portion 61 b is a portion exposed between the core wire crimping portion 12 and the coating crimping portion 13 in the terminal-attached electric wire 4 before the coating is formed. The coating 6 of the present embodiment integrally covers the tip 61a, the core wire crimping part 12, the intermediate exposed part 61b, the intermediate part 15, the covering crimping part 13, and the coating 62.

  More specifically, the coating 6 integrally covers the tip 61a of the core wire 61 and the tip 12a of the core wire crimping portion 12. The coating 6 blocks the tip 61a from the external space and restricts moisture and the like from entering from the terminal connection portion 11 side toward the tip 61a. The coating 6 may entirely cover the tip 12a of the core wire crimping portion 12. In the crimp terminal 1 formed from a base material plated with tin or the like, copper may be exposed at a location cut by press working or the like, for example, the tip 12a. When copper is exposed at the tip 12a, the tip 12a is entirely covered, so that the core wire 61 is hardly corroded.

  The coating 6 covers the groove 24 of the core wire crimping portion 12. As shown in FIG. 8, the coating film 6 of the ultraviolet curable resin 7 is filled in the groove 24. For example, the coating 6 is formed so that the position of the surface 6s of the coating 6 in the third direction H is equivalent to the apex position H1 of the curved portions 22b and 23b. The coating film 6 formed in the groove portion 24 restricts moisture and the like from entering the core wire 61 through the groove portion 24. Further, the coating film 6 formed in the groove portion 24 suppresses accumulation of moisture or the like in the groove portion 24. Since moisture or the like hardly accumulates in the groove portion 24, deterioration of the plating of the core wire crimping portion 12 is suppressed.

  The coating 6 formed on the core wire crimping part 12 is preferably formed in the range of the groove part 24 in the second direction W. For example, the film 6 may be formed in a range from the apex of the bending portion 22b to the apex of the bending portion 23b. By preventing the formation range of the film 6 from extending outside the range of the groove portion 24, the ultraviolet curable resin 7 is less likely to adhere to the side surface of the core wire crimping portion 12. As a result, crimp-wide variations are less likely to occur.

  As shown in FIG. 7, the coating 6 integrally covers the rear end 12b of the core wire crimping portion 12, the intermediate portion 15, the tip 13a of the covering crimping portion 13, the tip 62a of the covering 62, and the intermediate exposed portion 61b. The coating 6 blocks the intermediate exposed portion 61b from the external space and restricts moisture and the like from entering the intermediate exposed portion 61b. In addition, the film 6 may be made not to hang on the outer peripheral surface of the coating crimping part 13. For example, the coating 6 may be formed so as to cover the tip 13 a of the coated crimping portion 13 and not cover the outer peripheral surface of the coated crimped portion 13. By preventing the coating 6 from being formed on the outer peripheral surface of the coated crimping portion 13, variations in the height and width dimensions of the coated crimped portion 13 are less likely to occur.

  As described above, the coating 6 blocks the core wire 61 from the external space and restricts water from entering between the core wire 61 and the crimp terminal 1. Therefore, the film 6 can suppress the occurrence of corrosion in the electric wire with terminal. For example, when the material of the core wire 61 is aluminum and the material of the crimp terminal 1 is copper, when water enters between the two, the core wire 61 is corroded (galvanic corrosion) due to a difference in ionization tendency. Since the infiltration of water is restricted by the coating 6, the occurrence of corrosion is suppressed.

(Irradiation process)
The irradiation process is a process of irradiating the coating film 6 with ultraviolet rays. The irradiation process is performed after the film formation process is completed or in parallel with the film formation process. The irradiation process may be performed by a dedicated irradiation device or by the injection device 70. In the irradiation process, as shown in FIG. 9, ultraviolet rays are irradiated onto the coating 6 by the ultraviolet irradiation device 76. The coating 6 is cured by being irradiated with ultraviolet rays. When the film 6 is cured by the irradiation process, the manufacture of the terminal-attached electric wire 5 is completed.

  In the manufacturing method of the electric wire with a terminal of this embodiment, the film 6 is formed by the droplet 3 ejected intermittently. The ejection unit 72 can attach the droplet 3 to the target location with high accuracy. As a method for forming a film to be compared, for example, there is a coating method in which a paste-like resin is continuously ejected from a nozzle without a break while moving the nozzle. In this coating method, the followability of the resin with respect to the movement of the nozzle is not high. For this reason, the moving speed of the nozzle is limited, and it is difficult to improve productivity. Since the followability of the resin is low, there is a deviation between the position of the nozzle and the position where the discharged resin actually adheres to the electric wire or the like. In the method to be compared, it is difficult to control the application position and the application range, and application unevenness may occur and high anticorrosion reliability may not be realized.

  On the other hand, in the manufacturing method of the electric wire with a terminal concerning this embodiment, coat 6 is formed by ejection part 72 which ejects droplet 3 intermittently. In this method, the deviation between the ejection position of the nozzle 72a and the position where the ejected liquid droplet 3 adheres hardly occurs. In other words, it is possible to accurately hit the droplet 3 at a target location. The injection device 70 according to the present embodiment is less likely to be subject to followability restrictions as in the comparison target method. For this reason, the injection device 70 can improve productivity by increasing the moving speed of the nozzle 72 a and the moving speed of the holding unit 73.

  Moreover, the injection apparatus 70 of this embodiment can adjust the thickness of the film 6 easily. The thickness of the film 6 is adjusted by, for example, the relative moving speed between the nozzle 72a and the terminal-attached electric wire 4 before the film is formed. The thickness of the film 6 can be increased by reducing the relative speed or stopping the relative movement. On the other hand, the thickness of the film 6 can be reduced by increasing the relative speed.

  Further, the injection device 70 of the present embodiment forms the coating 6 without performing a relative movement in the third direction H. In the method to be compared, in order to realize a desired coating amount (coating thickness), it is necessary to move the nozzle up and down. For example, it is necessary to move the nozzle in the third direction H according to the height of the application target portion such as the core wire crimping portion 12 and the core wire 61.

  On the other hand, the injection device 70 of the present embodiment forms the coating 6 without moving the nozzle 72a in the third direction H. The ejection device 70 can attach an arbitrary amount of the droplet 3 to the target site regardless of the height of the target site (hereinafter simply referred to as “target site”) on which the coating film 6 is formed. Therefore, in the manufacturing method of the electric wire with a terminal of this embodiment, since the nozzle 72a does not move in the third direction H, the processing time of the film forming process is shortened. Moreover, the injection apparatus 70 of this embodiment can eliminate the resin sagging at the time of application | coating and can reduce material loss.

  In addition, as shown in FIG. 10, the injection device 70 may raise the surface 6s of the coating 6 beyond the apex position H1. The film 6 shown in FIG. 10 is filled in the groove portion 24 so as to rise to a position higher than the vertex position H1 of the curved portions 22b and 23b. In such a case, it is difficult for moisture and oil to enter the groove 24. Therefore, the terminal-attached electric wire 5 can be more reliably protected from galvanic corrosion.

  In the present embodiment, the amount of droplets 3 ejected at one time is determined as follows, for example. FIG. 11 shows a droplet 3 a that hits and adheres to the core wire crimping portion 12. The diameter D1 of the attached droplet 3a corresponds to the spreading width of the droplet 3 when attached to the core wire crimping portion 12. The diameter D1 of the droplet 3a is smaller than the width (crimp wide) Wd1 of the core wire crimping portion 12. Therefore, the ultraviolet curable resin 7 is unlikely to adhere to the side surface of the core wire crimping portion 12. Therefore, the injection device 70 of the present embodiment can suppress fluctuations in the width Wd1 due to the ultraviolet curable resin 7 adhering to the side surface.

  FIG. 12 shows another aspect of the injection device 70 according to this embodiment. In the injection device 70 shown in FIG. 12, the holding portion 73 </ b> A holds the terminal-attached electric wire 4 before the coating is formed in an inclined posture. The moving direction X of the holding portion 73A is a direction orthogonal to the axial direction of the nozzle 72a, in other words, a direction orthogonal to the ejection direction in which the droplet 3 is ejected. The moving direction X is, for example, the horizontal direction. 73 A of holding parts hold | maintain the electric wire 4 with a terminal before a film formation in an inclination attitude | position so that the 1st direction L may incline with respect to the moving direction X. FIG. In addition, in FIGS. 12-14, the electric wire 4 with a terminal before film formation is shown by the cross section. This cross section is a cross section along the central axis of the electric wire 60 and is a cross section orthogonal to the second direction W. The inclination angle θ of the first direction L with respect to the movement direction X is, for example, the following angle.

  FIG. 13 is an enlarged view of the main part of FIG. The inclination angle θ of this embodiment is determined so that the virtual line LI is parallel to the movement direction X. The imaginary line LI is a line connecting the upper end of the rear end 12b of the core wire crimping part 12 and the upper end of the tip 13a of the covering crimping part 13. That is, the inclination angle θ of the present embodiment is an angle at which the upper end of the rear end 12b and the upper end of the tip end 13a are substantially at the same position in the vertical direction. When the terminal-attached electric wire 4 before film formation is held at such an inclination angle θ, the core wire 61 extends substantially horizontally between the core wire crimping portion 12 and the covering crimping portion 13.

  The ejection unit 72 ejects the droplet 3 of the ultraviolet curable resin 7 to the terminal-attached electric wire 4 that is held in an inclined posture before the film formation. The ejection device 70 ejects the droplet 3 intermittently from the nozzle 72a while reciprocating the nozzle 72a in the second direction W. In addition, the ejection device 70 moves the holding unit 73 </ b> A along the movement direction X while ejecting the droplet 3 by the ejection device 70. That is, the ejection device 70 relatively moves the nozzle 72a and the terminal-attached electric wire 4 before the coating is formed in two directions orthogonal to the ejection direction (vertical direction) of the droplet 3. The droplet 3 attached to the terminal-attached electric wire 4 before the coating is formed forms a coating 8 (see FIG. 14). For example, the injection device 70 sequentially forms the coating 8 from the coated crimping portion 13 side toward the terminal connecting portion 11 side.

  The film 8 to be formed covers the core wire 61 and the crimp terminal 1 integrally as in the case of the film 6 described above. For example, as shown in FIG. 14, the coating 8 integrally covers the tip 61 a of the core wire 61, the core wire crimping portion 12, the intermediate exposed portion 61 b of the core wire 61, the coating 62, and the coating crimping portion 13. The ultraviolet curable resin 7 penetrates between the strands of the core wire 61. The ultraviolet curable resin 7 that has penetrated between the strands closes the opening of the coating 62. That is, the ultraviolet curable resin 7 not only covers the outer peripheral surface of the core wire 61 but also penetrates between the strands to cover each strand and close the opening of the covering 62.

  Further, the ultraviolet curable resin 7 is filled in a gap 16 generated between the crimp terminal 1 and the core wire 61. As shown in FIG. 13, a gap 16 is formed inside the crimp terminal 1. The gap 16 is a space surrounded by the core wire 61, the inner side surface of the crimp terminal 1, and the tip 62 a of the covering 62. The gap 16 shown in FIG. 13 is a space between the inner surface of the bottom 15 a of the intermediate portion 15 and the core wire 61. The gap 16 is formed in accordance with the level difference caused by the tip 62 a of the coating 62.

  Since the terminal-attached electric wire 4 before the coating is formed is held in an inclined posture, filling of the gap 16 with the ultraviolet curable resin 7 is promoted. The ultraviolet curable resin 7 that has penetrated between the strands of the core wire 61 and the ultraviolet curable resin 7 that hangs along the outer peripheral surface of the core wire 61 are guided to the gap 16. The void 16 is filled with the guided ultraviolet curable resin 7. Moreover, in this embodiment, the time for the ultraviolet curable resin 7 to osmose | permeate below is ensured by forming the film 8 in the coating | bonding crimping | compression-bonding part 13 first.

  Since the virtual line LI is substantially horizontal, the ultraviolet curable resin 7 attached to the core wire 61 hardly flows out along the first direction L. Accordingly, the coating 8 is unlikely to have thickness variations in the portion covering the intermediate exposed portion 61b. Further, since the ultraviolet curable resin 7 is difficult to move along the first direction L, the ultraviolet curable resin 7 attached to the upper surface of the intermediate exposed portion 61b penetrates downward as it is, as indicated by an arrow Y3. Easy to hear. Therefore, the gap 16 is easily filled with the ultraviolet curable resin 7.

  In addition, since the terminal-attached electric wire 4 before the coating is formed is held in an inclined posture, the ultraviolet curable resin 7 easily penetrates into the core wire 61 located inside the coating 62 as indicated by an arrow Y4. That is, closing of the opening of the coating 62 by the ultraviolet curable resin 7 is promoted. Since the terminal-attached electric wire 4 before the formation of the coating is inclined, the ultraviolet curable resin 7 can easily penetrate into the inner portion of the first direction L. The ultraviolet curable resin 7 accumulates in the gap 16 and the liquid level increases, so that the ultraviolet curable resin 7 easily flows into the opening of the coating 62. Moreover, the adhesiveness with respect to the core wire 61 of the ultraviolet curable resin 7 apply | coated to the intermediate | middle exposed part 61b improves. Since the gap 16 is filled with the ultraviolet curable resin 7 and the ultraviolet curable resin 7 easily penetrates into the space inside the coating 62, the terminal-attached electric wire 5 is more reliably protected from corrosion.

  In addition, since the terminal-attached electric wire 4 before the coating is formed is held in an inclined posture, the ultraviolet curable resin 7 hardly flows to the terminal connection portion 11 side. In addition, the coating 8 covering the tip 61a of the core wire 61 can be thickened. By increasing the thickness of the coating 8 that covers the tip 61a, redundancy in preventing the tip 61a from being exposed is improved.

  Note that the inclination angle θ may be larger than the angle at which the virtual line LI is horizontal. That is, the inclination angle θ may be an angle at which the upper end of the rear end 12b of the core wire crimping part 12 is positioned above the upper end of the tip 13a of the covering crimping part 13 in the vertical direction. The maximum value of the inclination angle θ may be 45 degrees, for example.

  When the coating 8 is formed, an irradiation process is performed. The irradiation process is performed after the film formation process is completed or in parallel with the film formation process. In the irradiation step, for example, the ultraviolet ray is irradiated to the coating 8 by the ultraviolet irradiation device 76 as in the irradiation step shown in FIG. The film 8 is hardened | cured by receiving an ultraviolet irradiation in an irradiation process. The irradiated ultraviolet rays are irregularly reflected on the surface of the core wire 61 and reach the ultraviolet curable resin 7 that has penetrated into the core wire 61. Accordingly, the ultraviolet curable resin 7 that has penetrated between the strands and the ultraviolet curable resin 7 that has penetrated into the space inside the coating 62 are cured in the irradiation process. In addition, the process which hardens the ultraviolet curable resin 7 may be made in parallel with the irradiation process or before and after the irradiation process. For example, a heat curing process may be performed.

  In addition, the injection apparatus 70 which holds the electric wire 4 with a terminal before film formation in an inclined posture may move the nozzle 72a and the electric wire 4 with a terminal before film formation in the vertical direction. For example, the injection device 70 may have a moving mechanism that moves the injection unit 72 relative to the main body 71 in the vertical direction (injection direction). Alternatively, the injection device 70 may have a moving mechanism that moves the holding portion 73A relative to the main body 71 in the vertical direction (injection direction).

  As explained above, the manufacturing method of the electric wire with a terminal concerning this embodiment includes a coat formation process (Drawing 6 and Drawing 7), and an irradiation process (Drawing 9). The coating forming step is a step of forming the coating 6 of the ultraviolet curable resin 7 that integrally covers the core wire 61 and the crimp terminal 1 on the terminal-attached electric wire 4 having the crimp terminal 1. The crimp terminal 1 includes a core wire crimping portion 12 in which a core wire 61 of an electric wire 60 is sandwiched between tips 22 a and 23 a of a pair of barrel pieces 22 and 23 connected to the bottom portion 21 and the bottom portion 21, and a sheath 62 of the electric wire 60. And a cover crimping portion 13 that is crimped to the cover. The irradiation process is a process of irradiating the coating film 6 with ultraviolet rays.

  The manufacturing method of the terminal-attached electric wire according to the present embodiment moves the discharge port 72c for intermittently ejecting the droplet 3 of the ultraviolet curable resin 7 and the terminal-attached electric wire 4 before forming the film in the film forming process. The film 6 is formed by the ultraviolet curable resin 7 injected from the discharge port 72c. The direction of relative movement between the discharge port 72c and the terminal-attached electric wire 4 before the coating is formed in the coating formation process is a direction orthogonal to the ejection direction of the droplet 3.

  The manufacturing method of the electric wire with a terminal of this embodiment forms the film 6 with the droplet 3 of the ultraviolet curable resin 7 inject | emitted intermittently. According to this film forming method, even if the distance between the ejection port 72c and the target site in the ejection direction varies, the position where the droplet 3 adheres is unlikely to shift. The manufacturing method of the electric wire with a terminal of this embodiment forms the film 6 without moving the discharge port 72c and the electric wire 4 with a terminal before film formation along the injection direction. Therefore, the manufacturing method of the electric wire with a terminal of this embodiment can shorten the time which a film formation process requires, and can aim at the improvement of productivity.

  The direction of relative movement between the discharge port 72c and the terminal-attached electric wire 4 before film formation in the film formation step is two directions orthogonal to the direction in which the droplet 3 is ejected. These two directions are the width direction (second direction W) of the crimp terminal 1 and the direction orthogonal to the width direction. The film 6 can be formed in an appropriate range by relative movement in two orthogonal directions. For example, the formation width of the film 6 in the width direction of the crimp terminal 1 can be arbitrarily adjusted. For example, it is possible to arbitrarily adjust the thickness of the coating 6 at each location. Therefore, the staying time of the nozzle 72a at each position can be minimized and productivity can be improved.

  In this embodiment, as for a pair of barrel piece parts 22 and 23, the curved parts 22b and 23b between the base end parts 22c and 23c connected to the bottom part 21, and front-end | tip 22a and 23a mutually contact | abut. In the film forming step, the ultraviolet curable resin 7 is filled in the groove 24 formed by the curved portions 22b and 23b in contact with each other. The ultraviolet curable resin 7 filled in the groove part 24 suppresses accumulation of moisture or the like in the groove part 24. Therefore, deterioration of the barrel pieces 22 and 23 is suppressed, and the reliability of the terminal-attached electric wire 5 is improved.

  In the film forming step, the groove portion 24 may be filled with the ultraviolet curable resin 7 so that the ultraviolet curable resin 7 rises to a position higher than the apex of the curved portions 22b and 23b. By filling the ultraviolet curable resin 7 in this way, the deterioration of the barrel pieces 22 and 23 is more reliably suppressed.

  In the present embodiment, the amount of the droplets 3 ejected at one time is an amount such that the spread width of the droplets 3 when attached to the core wire crimping portion 12 is narrower than the width of the core wire crimping portion 12. As a result, the ultraviolet curable resin 7 is prevented from adhering to the side surface of the core wire crimping portion 12.

[Modification of Embodiment]
In the film forming step, means for promoting the penetration of the ultraviolet curable resin 7 into the section covered by the coating 62 in the core wire 61 may be used. For example, a film forming process may be performed in the pressurizing chamber. In this case, the injection device 70 and the terminal-attached electric wire 4 before film formation are placed in the pressurizing chamber. In addition, it is preferable that the edge part on the opposite side to the crimp terminal 1 side in the electric wire 60 is placed outside the pressurizing chamber. The ultraviolet curable resin 7 attached to the core wire 61 is likely to penetrate toward the inside of the coating 62 due to the pressure difference.

  The coatings 6 and 8 of the ultraviolet curable resin 7 may be formed so as not to cover the coating crimping portion 13 and to cover the coating 62. For example, the films 6 and 8 may be formed so as not to cover at least the outer peripheral surface of the coated crimping part 13. In this case, the coatings 6 and 8 may be allowed to cover the tip 13a of the coated crimping portion 13.

  The contents disclosed in the above embodiments and modifications can be executed in appropriate combination.

1 Crimp terminal (terminal)
DESCRIPTION OF SYMBOLS 3 Droplet 4 Electric wire with a terminal before coating formation 5 Electric wire with a terminal 6,8 Coating 6s Surface 7 UV curable resin 11 Terminal connection part 12 Core wire crimping part 12a Tip 12b Rear end 13 Covering crimping part 13a Tip 14, 15 15a bottom part 15b side wall part 16 space | gap 21,31 bottom part (bottom wall)
22 First barrel piece (conductor caulking piece)
23 Second barrel piece (conductor caulking piece)
22a, 23a Tip 22b, 23b Curved portion 22c, 23c Base end portion 24 Groove portion 31 Bottom portion 32 Third barrel piece portion 33 Fourth barrel piece portion 40 Anvil 40a Support surface 50 Crimper 50a Caulking portion 51 First wall surface 52 Second wall surface 53, 56 Curved surface portion 54, 57 Intermediate portion 55, 58 Bottom portion 60 Electric wire 61 Core wire 61a Tip 61b Intermediate exposed portion 62 Cover 62a Tip 70 Injection device 71 Main body 72 Injection portion 72a Nozzle 72b Injection mechanism 73, 73A Holding portion 74 Arm portion 76 UV irradiation device 100 Terminal crimping device H1 Vertex position LI Virtual line Wd1 Width of core wire crimping portion L First direction W Second direction H Third direction X Movement direction θ Inclination angle

Claims (5)

A terminal including a core wire crimping portion in which a core wire of the electric wire is sandwiched between a tip of a pair of conductor crimping pieces connected to the bottom wall and the bottom wall, and a coated crimping portion crimped to the sheath of the wire A film forming step for forming a film of an ultraviolet curable resin that integrally covers the core wire and the terminal with respect to the electric wire with a terminal having,
An irradiation step of irradiating the coating with ultraviolet rays,
In the coating film forming step, the coating film is formed by the ultraviolet curable resin ejected from the ejection port while relatively moving the ejection port for intermittently ejecting the droplets of the ultraviolet curable resin and the electric wire with terminal. And
The method for producing a terminal-attached electric wire, wherein a direction of relative movement between the discharge port and the electric wire with terminal in the film forming step is a direction orthogonal to an ejection direction of the droplet. The direction of relative movement between the discharge port and the terminal-attached electric wire in the film forming step is two directions orthogonal to the direction of ejection of the droplets,
The method of manufacturing an electric wire with a terminal according to claim 1, wherein the two directions are a width direction of the terminal and a direction orthogonal to the width direction. In the pair of conductor crimping pieces, curved portions between a base end connected to the bottom wall and a tip holding the core wire are in contact with each other,
The manufacturing method of the electric wire with a terminal according to claim 1 or 2 in which in said film formation process, said ultraviolet curing type resin is filled into a slot formed by said curved parts which mutually contacted. The method for manufacturing a terminal-attached electric wire according to claim 3, wherein, in the film forming step, the groove portion is filled with the ultraviolet curable resin so that the ultraviolet curable resin rises to a position higher than a vertex of the curved portion. The amount of the droplets ejected at one time is an amount such that the spread width of the droplets when attached to the core crimping portion is narrower than the width of the core crimping portion. The manufacturing method of the electric wire with a terminal of 1 item | term.

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